ALPINESTARS BIO ARMOR BACK PROTECTOR (LARGE) (BLACK) This highly advanced back protector uses the very latest impact absorption materials to provide class-leading protection in a slimline and lightweight package. The protector is designed to fit in the back compartment of selected Alpinestars jackets to provide superior safety without compromising the fit of your jacket. Specifically designed for use in the latest range of Alpinestars' leather and textile jackets to provide class-leading safety. Constructed with Alpinestars' exclusive Bio Armor, offering exceptional levels of impact protection. Lightweight construction.